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Method of creating map data

  • US 8,868,335 B2
  • Filed: 06/09/2010
  • Issued: 10/21/2014
  • Est. Priority Date: 08/25/2009
  • Status: Active Grant
First Claim
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1. A computerised method of creating map data, comprising:

  • processing, using a processor, sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises;

    determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and

    determining a variance of the offset values for the points in the set;

    filtering the sets of position data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height;

    deriving information about lanes of the road based upon the filtered position data; and

    generating map data using the derived information.

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